HELP ME ASAP PLEASE
A car with mass 1000kg moving to the right with a velocity of 4m/s hits an 800kg car moving to the left with a velocity of 3m/s. If the second car moves 2m/s to the right. What is the velocity of the first car after the collision?

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An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.